Abstract
2-Aminooxyisobutyric acid (AOIB) has a partial structure of aminooxyacetic acid (AOA) in its whole structure, and resembles 2-aminoisobutyric acid (AIB) in their tetrahedral structures. Both AOA and AIB are inhibitors of ethylene biosynthesis; AOA inhibits the action of 1-aminocyclopropane-1-carboxylate (ACC) synthase and AIB inhibits that of ACC oxidase. The present study showed that AOIB inhibited the in vitro activities of both ACC synthase and ACC oxidase, which were synthesized heterologously in E. coli cells from corresponding carnation cDNAs, and the magnitudes of inhibition were similar to those caused by AOA and AIB; AOIB and AOA at 0.1 mM inhibited ACC synthase action by 75%, and AOIB and AIB at 10 mM inhibited ACC oxidase action by 16.3 and 22.5%, respectively. AOIB at 1 mM caused 91.5% reduction of maximum ethylene production rate as compared to the control in cut ‘Excerea’ carnation flowers undergoing senescence, thereby lengthening their vase life to 7 d from 3 d of the control flowers. The inhibition by AOIB was probably caused by its action resembling AOA, but not AIB. AOIB also extended significantly the vase life of cut flowers of ‘Pax’ carnation, and tended to do so in ‘Primero Mango’ carnation. The present findings suggest the potential of AOIB as a new preservative for carnations and other ornamentals in which ethylene plays a key role in the induction of senescence.
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Kosugi, Y., Matsuoka, A., Higashi, A. et al. 2-Aminooxyisobutyric acid inhibits the in vitro activities of both 1-Aminocyclopropane-1-carboxylate (ACC) synthase and ACC oxidase in ethylene biosynthetic pathway and prolongs vase life of cut carnation flowers. J. Plant Biol. 57, 218–224 (2014). https://doi.org/10.1007/s12374-014-0180-4
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DOI: https://doi.org/10.1007/s12374-014-0180-4